Multipartite entangled light from driven microcavities
D. Pagel, H. Fehske, J. Sperling, and W. Vogel

TL;DR
This paper investigates the generation of multipartite entangled light from driven microcavities, demonstrating the emission of fourpartite W states and methods to detect entanglement even in lossy environments.
Contribution
It introduces a novel approach to generate and characterize multipartite entangled light from semiconductor microcavities using entanglement witnesses.
Findings
Emission of fourpartite W states from microcavities
Entanglement detection methods applicable in lossy media
Derivation of entanglement conditions based on W states
Abstract
The generation and the characterization of multipartite entangled light is an important and challenging task in quantum optics. In this paper the entanglement properties of the light emitted from a planar semiconductor microcavity are studied. The intracavity scattering dynamics leads to the emission of light that is described by a fourpartite W state. Its multipartite correlations are identified by using the method of entanglement witnesses. Entanglement conditions are derived, which are based on a general witness constructed from W states. The results can be used to detect entanglement of light that propagates through lossy and even turbulent media.
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